The engine is used for pumping water out of the mine.
这台发动机是用来从矿井中抽水的。
Remember this engine is running backward, and we're pumping heat up.
记住这个热机是反向运行的，我们把热量向上传输。
It also minimises the pumping losses caused by no longer having to "throttle" (ie, strangle) the air flowing into the cylinders in order to control the engine speed.
这样还把由于不必再为了控制引擎转速来抑制空气流入引起的抽吸效应的能耗最小化。
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